Fuel injection nozzles



Feb. 17, 1959 c, H, NYSTROM 2,874,000

FUEL. INJECTION NOZZLE-S I Filed March 13, 1957 I F'ig. Z.

\E-u'nnuu 4 I INVENTOR. p CA1? L H. NVGTEOM nection with theaccompanying drawings.

United v States Patent FUEL INJECTION NOZZLES (Iarl H. Nystrorn, WestSpringfield, Mass., assignor to American Bosch Arma Corporation, acorporation of New York Application March 13, 1957, Serial No. 645,844

' 3 Claims. (Cl. 299107.6)

This invention relates to nozzles for fuel injection apparatus and hasparticular reference to a relatively simple and inexpensive nozzleparticularly adapted for fuel injection for spark ignition type internalcombustion engines.

This application is a continuation in part of my application SerialNumber 569,983, filed March 7, 1956.

The principal object of the invention is to provide a relatively simpleand inexpensive, yet efficient fuel injection nozzle and the process ofmaking the same.

Another object is to provide a new and improved sealing arrangement forfuel injection nozzles.

Another object is to provide a nozzle of the type set forth wherein thenozzle operating members may be assembled into a unit which may then beoperatively connected to the nozzle body.

Another object is to provide a nozzle wherein hardening,-grinding andlapping operations are reduced to a minimum.

Other objects and advantages of the invention will be apparent from thefollowing description taken in con- It will be understood that changesmay be made in the details of construction and arrangement of partswithout departing from the spirit of the invention as set forth in theaccompanying claims, as the preferred forms have been given by way ofillustration only.

Referring to the drawings:

Fig. 1 is a longitudinal sectional view of a nozzle constructedaccording to the invention;

Fig. 2 is a fragmentary view generally similar to Fig. l, but showinganother form of the invention;

Fig. 3 is a fragmentary view, on an enlarged scale, illustrating a stepin the manufacture of the form of the invention shown in Fig. 2; and.

Fig. 4 is a fragmentary view generally similar to Fig. 2, but showing amodified form of the invention.

Referring more particularly to the drawings, wherein similar referencecharacters designate corresponding parts throughout, the nozzle shown inFig. 1 comprises the nozzle body having the chamber 11 adjacent one endthereof, and the passage 12 through which fuel passes to chamber 11.

In the manufacture of the nozzle, the nozzle body 10 is formed withchamber 11 and passage 12 as previously described, with chamber 11having an open side and the wall of said chamber is provided with theinner recess or groove 13 with the flange 14 and the nozzle unitcomposed of the valve plate assembly is inserted into said chamber andthe end 15 is then crimped over the end of the valve plate assembly toretain the nozzle unit in operative relation with the nozzle body.

The valve plate assembly comprises an annular disk 16 of rubber, plasticor other resilient material and preferably of a material relativelyimpervious to gasoline or fuel oil and is preferably of a material suchas rubber, plastic or other resilient material supported by rigidsupport 17, preferably of steel to which disc 16 is bonded.

2,874,000 Patented Feb. 1 7,

'as a unit, which unit is then assembled into the nozzle body.

If desired, valve 19 may have a resilient outer surface 20b as shown inFig. 4, and the disk 16 could then be either resilient or rigid, asdesired. It will be seen from the foregoing that with such con structionthe accuracy or tolerances for the valve and/or the opening in disc 16need not be as accurately controlled as would otherwise be required andthat the valve will still seat on the disc and prevent leakage of fuel.

In the form of the invention of Figs. 2 and 3, the disk 16a is providedof metal, such as steel or the like, with a layer 18 of resilientmaterial as described above bonded thereto to form a resilient seat forvalve 19. This layer may be inserted as shown in the drawings, ifdesired.

In this form of the invention there is provided a peripheral groove indisk 16a and in this groove is positioned a ring 23 of sealing materialto seal the connection of the periphery ofthe disk and the wall ofchamberll. This ring 23 may be formed with an extension or projection23a which is then compressed when the disk is positioned within thechamber and increases the seal between the parts, as shown in Fig. 3, orthe ring 23 ma be straight sided or of other desired contour.

This seal between the periphery of the disk and the adjacent wall of thechamber prevents the passage of fuel from chamber 11 to the combustionchamber except through the opening controlled by pintle 19.

As 'shown in Fig. 4, resilient coating 20b may be formed on the valveportion 20a of pintle 20 or bonded thereon and plate 16:: may beprovided with a peripheral groove or slot for reception of sealing ring24.

The operation of the invention is believed apparent from the foregoingdescription.

From the foregoing it will be seen that I have provided new and improvedmeans for obtaining all of the objects and advantages of the invention.

I claim:

1. In a device of the character described, a nozzle body having a fuelpassage extending therethrough, means on one end of said nozzle body forconnecting said body to a holder, said body having a chamber adjacentthe end thereof opposite said connecting means, said chamber connectingwith said fuel passage, an internal annular shoulder in the walladjacent the free end of 7 said chamber portion, an annular plate insaid chamber having a discharge passage therethrough and having itsperiphery engaging said internal annular shoulder, the end of said bodybeing turned over said plate member to retain said plate member inposition on said shoulder, an outwardly opening valve member extendingthrough said discharge opening in said plate, spring means in saidchamber adapted to normally retain said valve member in closed positionin said discharge orifice, said plate member having a peripheral grooveand sealing means in said groove for preventing leakage between theperiphery of said plate and the adjacent wall of said body, andresilient means forming a sealing connection between said valve memberand the adjacent surface of said discharge orifice in said plate member.

2. In a device of the character described, a nozzle body having a fuelpassage extending therethrough, means on one end of said nozzle body forconnecting saidbody to a holder, said body having a chamber adjacent theend thereof opposite said connecting means, said chamber connecting withsaid fuel passage, an internal annular shoulder in the wall adjacent thefree end of said chamher portion, an annular plate in said chamberhaving a discharge passage therethrough and having its peripheryengaging said internal annular shoulder, the end of said body beingturned over said plate member to retain said plate memberin position onsaid shoulder, an outwardly opening valve member extending through saiddischarge opening in said plate, spring means in said chamber adapted tonormally retain said valve member in closed position in said dischargeorifice, said plate member having a peripheral groove and sealing meansin said groove for preventing leakage between the periphery of saidplate and the adjacent Wall of said body, and resilient means forming asealing connection between said valve member and the adjacent surface ofsaid discharge orifice in said plate member, said sealing means beingcarried by said valve member.

3. In a device of the character described, a nozzle body having a fuelpassage extending therethrough, means on one end of said nozzle body forconnecting said body to a holder, said body having a chamber adjacentthe end thereof opposite said connecting means, said chamber connectingwith said fuel passage, an internal annular shoulder in the walladjacent the free end of said chamber portion, an annular plate in saidchamber having a discharge passage therethrough and having its peripheryengaging said internal annular shoulder, the end of said body beingturned over said plate member to retain said plate member in position onsaid shoulder, an outwardly opening valve member extending through saiddischarge opening in said plate, spring means in said chamber adapted tonormally retain said valve member in closed position in said dischargeorifice, said plate member having a peripheral groove and sealing meansin said groove for preventing leakage between the periphery of saidplate and the adjacent wall of said body, and resilient means forming asealing connection between said valve member and the adjacent surface ofsaid discharge orifice in said plate member, said sealing means beingcarried by said plate member.

References Cited in the file of this patent UNITED STATES PATENTS2,164,411 Kennedy July 4, 1939 2,255,119 Kennedy Sept. 9, 1941 2,368,887Schuler Feb. 6, 1945 2,591,407 Cornelius Apr. 1, 1952 2,768,860 MillerOct. 30, 1956 FOREIGN PATENTS 578,932 Great Britain July 17, 1946

